Hi NC
AS16 (like ASN) writes an entry to exe.xml. This is what it added to mine:
<Launch.Addon>
<Name>as_btstrp_config_manager</Name>
<Disabled>False</Disabled>
<Path>as_srv\as_btstrp_config_manager.exe</Path>
</Launch.Addon>
</SimBase.Document>
It's possible that you don't have an exe.xml present or.. it's garbled in some way. Not many programs write to exe.xml.. most add bits to dll.xml so unless you've used a program that actually needs it, you may not have noticed.
EDIT: I see you have both FSX and FSX SE installed. Depending on which one you're using, check to see if exe.xml is present. It's possible AS16 doesn't know where to look.
ATB
DaveB